Golf-ball.



UNITED STATES Patented June 2, 1903.

PATENT OFFICE.

ROBERT HUTCHISON, OF PRESTWICK, SCOTLAND.

GOLF-BALL.

SPECIFICATION forming part of Letters Patent No. 730,127,dated June 2,1903.

Application filed January 31, 1903. Serial No. 141,365. (No model.) r

To all whom it may concern:

Be it known that I, ROBERT HUTCHISON, a

subject of the King of Great Britain and Ireland, and a resident ofPrestwick, in the county of Ayr, Scotland, (whose postal address isEarlston, Prestwick, in the county of Ayr, Scotland,) have inventedcertain new Improvements in Golf-Balls, (for which I have applied for aBritish patent, No. 11,801, dated May 24, 1902,) of which the followingis a specification.

My said invention has for its object to imgutta-percha or balata, whichis first hard- -ened by any known process, such as by treatment withnaphtha, to extract the resins therein and to which may be added-rubberin such proportion as is required, according to the hardness desired inthe ball. With the materials so treated I incorporate lime'in theproportion of about fiveper cent, by weight, though this proportion maybe varied, the lime being, by preference, slaked to the consistency of acream and added to the material while the latter is softened by heat,which should not, by preference, exceed 2LO Fahrenheit. The ingredientsare m'asticated together in any suitable known form of masticator untilthe water is evaporated and leaves a homogeneous mass. increases thedryness and toughness of the material and at the same time givesadditional weight to the composition. To the re sultant mass thus formedthere is added such a percentage of sulfur as, aided by the lime, willvulcanize so muchof the material as will give the mass the maximumelasticity ob tainable without at the same time reducing its cohesiveproperty below that at which separate pieces, While heated, preferablyto a temperature of from 212 to 230 Fahrenheit, can be joined firmlytogether by pressure. The proportion of sulfur may vary;

but one and one-half to two per cent. by

weight, will be found to give good results. The vulcanizmg process iscarried out by subectmg the mass, by preference, in the masth- Thisaddition of lime.

cator to frictional heat, whereby thetemperature of the mass,whichshould be, by preference, below 240 Fahrenheit, is raised locally by thefriction. This low temperature for the mass is below that required forthe usual process of vulcanizing and has the effect of localizing theaction of the sulfur. treatment of the mass a composition isobtainedwhich has good cohesive property, great toughness and elasticity, andthe composition can be molded in the usual manner into balls which willbe found to possess increased resiliency and durability.

Instead of lime any other substance having similar properties tolime'such,for example, as baryta, strontia, or 1nagnesiamay be em ployedeither partially or wholly in the process, and the order in which theingredients are added may also be Varied.

Instead of forming a golf-ball entirely from my improved composition Imay use the composition in the formation of any part of such a ballas,for instance, an outer covering or an inner coreor I may use thecomposition as an ingredient together'with other materials.

WVhat I claim as my invention is 1. A new composition for golf-balls orparts of golf-balls comprising hardened gutta-percha or balata andrubber, five per cent. by weight of lime, and one and one-half to twoper cent. by weight of sulfur.

2. A new composition for golf-balls or parts of golf-balls comprisinghardened gutta-percha or balata, five per cent.by weight of lime, andone and one-half to two per cent. by weight of sulfur.

3. Anew composition for golf-balls or parts of golf-balls comprisinghardened gutta p'ercha or balata, rubber, lime and sulfur.

. l. Anew composition for golf-balls or parts of golf-balls comprisinghardened guttaper By this

